Inventor

Isamu Hirai

Inventor

Tokyo, JP

Overview

55→

Patents

1986–2015

Patent span

Physics

Primary field (CPC G)

Patents· 55 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G03Bprimary

G03BApparatus or arrangements for taking photographs or for projecting or viewing them70%

G02BOptical elements, systems or apparatus16%

H04NPictorial communication, e.g. television7%

G01JMeasurement of intensity, velocity, spectral content, polarisation, phase or pulse characteristics of infrared, visible or ultraviolet light3%

G01SRadio direction-finding3%

H10FInorganic semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation1%

PatentTitleYear

9,179,049'Optical device and single lens reflex camera'2015 8,072,508'Photographing apparatus having first and second operation devices'2011 7,990,432'Photographing apparatus having first and second operation devices'2011 7,961,245'Image surface illuminance varying apparatus, exposure correcting apparatus, and exposure correcting method'2011 7,961,250'Photographing apparatus having an exposure mode selection function'2011 7,692,708'Photometric apparatus'2010 7,683,410'Image pickup device'2010 6,718,134'AF auxiliary light projector for AF camera'2004 6,707,997'Flash control system'2004 6,603,928'Photometry device'2003 6,571,058'Photometry device'2003 6,567,617'Photometry device with light and colorimetric sensors'2003 6,556,788'Photometry device'2003 6,535,693'Photometry device'2003 6,510,285'Strobe control device'2003 6,510,284'Photometry device for a camera including external light sensor'2003 6,507,709'Photometry device'2003 6,487,372'Photometry device'2002 6,369,380'Light receiver unit having a light receiving element and a packaging cover'2002 6,229,602'Photometering apparatus'2001 6,222,622'Photometering apparatus for a camera'2001 6,108,496'Exposure control system for camera'2000 6,021,006'Optical system having composite prism'2000 6,014,525'Photometric device'2000 6,014,273'Photometering apparatus'2000 5,999,753'Single-lens reflex camera'1999 5,969,869'Prism'1999 5,970,263'Photometering lens for SLR camera and adjusting of photometering device'1999 5,915,133'Camera with a photographic mode automatic selecting apparatus'1999 5,913,087'Indicating apparatus within viewfinder of single lens reflex camera'1999 5,895,133'Exposure mode selecting device'1999 5,774,746'Camera with learning function'1998 5,713,053'TTL exposure control apparatus in an interchangeable lens camera'1998 5,682,558'Camera with learning function'1997 5,602,616'Exposure control apparatus of camera'1997 5,581,314'Camera with stereoscopic optical system'1996 5,557,366'Strobe control device for camera'1996 5,508,779'Auto-bracketing system'1996 5,485,242'Exposure control apparatus of camera'1996 5,471,276'Photometry system'1995 5,382,997'Exposure control apparatus of camera'1995 5,351,105'Auto focus camera'1994 5,325,147'Exposure control apparatus of a camera'1994 5,289,225'Photometering apparatus of camera for variably weighting different areas of an image area'1994 5,280,319'Exposure control apparatus of camera including exposure factor limit value setting means'1994 5,274,429'Distance measuring device'1993 5,170,205'Eliminating camera-shake'1992 5,168,298'Auto focus camera'1992 5,137,350'Distance measuring device'1992 5,126,780'Exposure control apparatus and photographing lens in camera'1992 5,021,818'Multi-area brightness measuring apparatus'1991 5,012,268'Exposure control device for interchangeable lens camera'1991 5,005,042'Electric control camera'1991 4,978,981'Exposure control device'1990 4,571,047'TTL Focus detecting device for single-lens reflex camera'1986

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1986–2002Patents assigned to ASAHI OPTICAL CO LTD (38)· patent assignee history

1986–2015Based in Tokyo, JP· patent location history

1992–1993Based in Fuchu, JP· patent location history

2003–2004Patents assigned to PENTAX CORP (10)· patent assignee history

2010–2011Patents assigned to HOYA CORP (5)· patent assignee history

2011–2015Patents assigned to HIRAI ISAMU (2)· patent assignee history

2011Patents assigned to OHKURA TADAHISA (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
ASAHI OPTICAL CO LTD	38	1986–2002
PENTAX CORP	10	2003–2004
HOYA CORP	5	2010–2011
HIRAI ISAMUself	2	2011–2015
OHKURA TADAHISA	1	2011

Locations

Location	Patents	Span
Tokyo, JP	53	1986–2015
Fuchu, JP	2	1992–1993